Of course there is. You can go to the first "Accounts" tab and click on the key symbol on the top right corner.
From there you can create a new HD wallet or go to "Advanced" at the bottom of the page where you can import an old wallet or and hardware wallet.
Well even though it is possible to create another HD wallet or any other type once you restore his back up but keep in mind that it all would be under the same master seed.
On the other hand, you can add unrelated account but they will not be included in your master seed back up.